I was over at an aunt's house way back when (I was probably ~12), and when I went to the bathroom, I found one of my youngest baby cousin's pairs of Gerber plastic pants drying on the towel rack. How could I resist???
I knew I could claim I was going #2, and had enough bathroom time, so I quickly dropped my jeans & undies, and gently pulled those Gerber's up my legs, keeping them from ripping (I was pretty skinny at the time)... Well, just about the moment I was to revel in it all, and take a look at myself in the mirror (and probably feel the shame...), there was a knock at the outside window (of a second story house). Turns out my other cousin (the eldest in the household) had actually gone out on the roof, and was there knocking on the window, for shits 'n giggles. Well whatever sense of fun I was about to have turned to absolute mortification & horror, at that moment, cause this cousin had a grande boca (BIG mouth)!
I immediately dropped to my knees, in a vain attempt to try to hide what I was wearing. Strangely, nothing was ever said about it, and I was sure not asking, either.
Just when you never expect it...